B513 Planning Meeting, 7^th November 2002

Present: Nigel Baddams, Tony Cass, Anne Funken, Jukka Lindroos, Jose Miranda, Bruno Pichler

1. Previous Minutes

2.2 2a: We still need to understand the cost for boring tubes to the technical gallery.
2.2 2b: Anne has an appointment with Guy Salomon/TIS to discuss the safety requirements for routing 18kV cables..

2. Substation Planning

Anne remains concerned about coping with the impact of 3^rd harmonics. Ensuring adequately sized neutral conductors is the main issue but purchasing higher capacity equipment (with high cross sections for all conductors) is expensive and it is not possible to modify all of the necessary equipment. Some form of compensation equipment to reduce the level of neutral currents will therefore be needed. Two sorts of equipment are available:

Active filters. These can only be placed in the machine rooms as there are no models large enough to handle the aggregate loads at the substation level.
Passive filters can be located either in the machine rooms or in the substation.

There is a strong preference for compensation equipment to be installed in the machine rooms as this allows smaller cables to be used between the substation and the machine room. Space has been allocated for filters in the substation, however, so there is no need to delay design of the bunker whilst the filter arrangements are finalised.
Choice of which type of compensation (active or passive) to use will depend on space and price considerations. Passive filters are cheaper, but standard passive filter unit cannot be maintained live. If continuity of service during maintenance or after failure is required then the unit cost increases from €20K to €60K! Filters that reduce the level of neutral currents by 50% (rather than by 90%) are being considered.
In principle, we can simply allocate space for filters in the machine room PDUs now and install filters later only if they are needed. However, installation of the filters would require a service interruption.

Nigel showed the latest plans for the bunker. Taking into account the 5.8m width of the 18kV room, the overall length is now 27.2m. There is no ”double wall” at the Jura end; extending the reinforcement bars beyond the end of the bunker is adequate to allow for any future extension.
Jose commented that the increased length of the bunker meant an increased cost and could prevent us from using the existing market survey. Our options in this area need to be studied carefully as there is not much time if the new substation is to be in service at the end of February 2004.
A review of the various installation delays suggested that the tender for the bunker should require construction to start on May 1^st, with completion expected to be at the end of September. This would allow installation of the electrical equipment from October.

There was again much discussion about how to route cables into and out of the bunker. Nigel and Jose were concerned about the structural implications of a caniveau along the length of the S-206 and, more generally, bringing cables in under the foundations of B513. Despite the limited clearance, the only option is to route cables at ceiling level.
As the cables from the transformers will now be routed vertically into the 18kV room there is no need for a caniveau between the ducts along the wall of B513. It was therefore agreed to draw up plans such that cables could be routed at all possible places along the common wall (excluding only ducts and joists). This allows the building design to be finalised now, avoiding the need to wait for precise planning of cable routes.
It was agreed that Nigel would prepare the final designs for November 15^th and that Jose would look into ways in which various contracts can be used and how to arrange the design study. Although a Site Committee review is required before placing the construction order, we already have approval for the design study phase

Jukka presented a cost breakdown of the work required to support a 2.5MW load (900KCHF) and to upgrade to support a 4MW load (a further 1,200KCHF). He confirmed that work for the 2.5MW solution could be carried out in 2005-7 and that the upgrade for 4MW could take place later without any interruption to services (although some work might have to be scheduled in winter).

Costs to support 2.5MW equipment load	KCHF
New 2MW chiller	350
2 pumps; 500m³/hr capacity, with variable speed control	100
Additional cooling coils in the stations	100
Chilled water piping	200
Duct modifications	50
Miscellaneous & contingency	100
Total	900
Additional costs to support 4MW equipment load
Replace 2 chillers with 2MW models	700
2 additional 1.5MW cooling towers, with associated pumps	180
Condenser piping	100
Duct modifications	100
Miscellaneous & contingency	100
Total	1180
Maintenance required during LHC operation
Replace old 1.2MW chiller	250

The 4MW solution requires the replacement of the existing chillers with higher capacity units. If we do not upgrade, these chillers will, for maintenance reasons, need to be replaced with equivalent capacity at some point during LHC operation. However, as for the upgrade, any replacement could be done without any interruption to services—in fact, Jukka confirmed that all maintenance work could be undertaken without interrupting services, at least during winter.
More time is needed to study the power needs for 4MW solution, but Jukka agreed to provide this information to Anne by November 15^th.